"DH unfortunately always defends her"
"and that contributed to her attempting suicide when he was 16"
These are the problem!
1 he is NOT responsible for her suicide attempt - that is down to her and I'd be strongly recommending he get counselling.
2 you're going to get nowhere until you have his support.
He is deep in FOG I strongly suspect she is a martyr narcissist. As is my mother. Particularly difficult to deal with I think, as with other narcissist types there is more "obvious" nastiness even to the people in your dh's position.
He needs therapy with someone who REALLY understands npd and toxic families.
Also highly likely other DIL is seen as OK because other son is golden child, and your dh scapegoat and your being the "bad" DIL is simply her extending his role as scapegoat to you and your DS (nope not even kidding about DS)
Frankly in your position I'd be keeping DS the hell away from her!
Like hell would I be going on that holiday! Her behaviour at the meal was fucking disgusting! And your dh knows this!
You and dh should look at this site
outofthefog.website/personality-disorders-1/2015/12/6/histrionic-personality-disorder-hpd
Personally I'd have left the meal after the 2nd time she started the nappy nonsense and told dh if he knew what was good for him he'd leave too!
But I'm mostly the other end of the fog now. Plus age means you get less tolerant of other people's bullshit!
Women also are far too socialised to be "nice" in my case it's my parents are toxic and my ex pretty early on had no reservations in not accepting their crap and being clear he expected me to back him up when they were being shitty - which was bloody hard and felt like he was being unreasonable at the time but he was right (for once 😂).
TiredGirly those of us assessing the mil has made him feel guilty for her suicide attempt are probably like me well experienced in dealing with this type of personality (hers). This is classic use of guilt to control.
"Your oh can take the baby to see her, why should you bother." With this particular mil I would recommend NOT doing this, she's already been extremely derogatory to the child - questioning its paternity, decrying it as "dirty and smelly" and with the paternity stuff I suspect she's racist too. Like fuck would a child of mine be dealing with that! She doesn't FULLY accept the child as her grandchild and treats them literally like dirt? Doesn't get a relationship with them!
Acrossthepond - my exmil similar, our first spat after marrying (his laziness round the house) she gave him 2 bollockings!
1 for the laziness "G is not your unpaid maid pick up your own shit! You're an adult?"
2 "and don't be a bloody tell tale! I'm not having you on the phone every time you don't get your own way!" 😂miss her in my life she was ace!